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Subject: [PATCH v7 06/12] x86/resctrl: Introduce data structure to support
 monitor configuration
From:   Babu Moger <babu.moger@amd.com>
To:     <corbet@lwn.net>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
CC:     <fenghua.yu@intel.com>, <dave.hansen@linux.intel.com>,
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        <sandipan.das@amd.com>, <tony.luck@intel.com>,
        <james.morse@arm.com>, <linux-doc@vger.kernel.org>,
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        <eranian@google.com>
Date:   Mon, 17 Oct 2022 17:26:46 -0500
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Add a new field in mon_evt to support Bandwidth Monitoring Event=0A=
Configuration(BMEC) and also update the "mon_features" display.=0A=
=0A=
The sysfs file "mon_features" will display the monitor configuration=0A=
if supported.=0A=
=0A=
Before the change.=0A=
	$cat /sys/fs/resctrl/info/L3_MON/mon_features=0A=
	llc_occupancy=0A=
	mbm_total_bytes=0A=
	mbm_local_bytes=0A=
=0A=
After the change if BMEC is supported.=0A=
	$cat /sys/fs/resctrl/info/L3_MON/mon_features=0A=
	llc_occupancy=0A=
	mbm_total_bytes=0A=
	mbm_total_config=0A=
	mbm_local_bytes=0A=
	mbm_local_config=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/core.c     |    3 ++-=0A=
 arch/x86/kernel/cpu/resctrl/internal.h |    4 +++-=0A=
 arch/x86/kernel/cpu/resctrl/monitor.c  |    7 ++++++-=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 ++++-=0A=
 4 files changed, 15 insertions(+), 4 deletions(-)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct=
rl/core.c=0A=
index d79f494a4e91..46813b1c50c2 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/core.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/core.c=0A=
@@ -814,6 +814,7 @@ static __init bool get_rdt_alloc_resources(void)=0A=
 static __init bool get_rdt_mon_resources(void)=0A=
 {=0A=
 	struct rdt_resource *r =3D &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;=
=0A=
+	bool mon_configurable =3D rdt_cpu_has(X86_FEATURE_BMEC);=0A=
 =0A=
 	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))=0A=
 		rdt_mon_features |=3D (1 << QOS_L3_OCCUP_EVENT_ID);=0A=
@@ -825,7 +826,7 @@ static __init bool get_rdt_mon_resources(void)=0A=
 	if (!rdt_mon_features)=0A=
 		return false;=0A=
 =0A=
-	return !rdt_get_mon_l3_config(r);=0A=
+	return !rdt_get_mon_l3_config(r, mon_configurable);=0A=
 }=0A=
 =0A=
 static __init void __check_quirks_intel(void)=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r=
esctrl/internal.h=0A=
index 16e3c6e03c79..b458f768f30c 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/internal.h=0A=
+++ b/arch/x86/kernel/cpu/resctrl/internal.h=0A=
@@ -63,11 +63,13 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);=0A=
  * struct mon_evt - Entry in the event list of a resource=0A=
  * @evtid:		event id=0A=
  * @name:		name of the event=0A=
+ * @configurable:	true if the event is configurable=0A=
  * @list:		entry in &rdt_resource->evt_list=0A=
  */=0A=
 struct mon_evt {=0A=
 	enum resctrl_event_id	evtid;=0A=
 	char			*name;=0A=
+	bool			configurable;=0A=
 	struct list_head	list;=0A=
 };=0A=
 =0A=
@@ -522,7 +524,7 @@ int closids_supported(void);=0A=
 void closid_free(int closid);=0A=
 int alloc_rmid(void);=0A=
 void free_rmid(u32 rmid);=0A=
-int rdt_get_mon_l3_config(struct rdt_resource *r);=0A=
+int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable);=0A=
 void mon_event_count(void *info);=0A=
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);=0A=
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re=
sctrl/monitor.c=0A=
index efe0c30d3a12..4b8adb7f1c5c 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/monitor.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c=0A=
@@ -746,7 +746,7 @@ static void l3_mon_evt_init(struct rdt_resource *r)=0A=
 		list_add_tail(&mbm_local_event.list, &r->evt_list);=0A=
 }=0A=
 =0A=
-int rdt_get_mon_l3_config(struct rdt_resource *r)=0A=
+int rdt_get_mon_l3_config(struct rdt_resource *r, bool configurable)=0A=
 {=0A=
 	unsigned int mbm_offset =3D boot_cpu_data.x86_cache_mbm_width_offset;=0A=
 	struct rdt_hw_resource *hw_res =3D resctrl_to_arch_res(r);=0A=
@@ -783,6 +783,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)=0A=
 	if (ret)=0A=
 		return ret;=0A=
 =0A=
+	if (configurable) {=0A=
+		mbm_total_event.configurable =3D true;=0A=
+		mbm_local_event.configurable =3D true;=0A=
+	}=0A=
+=0A=
 	l3_mon_evt_init(r);=0A=
 =0A=
 	r->mon_capable =3D true;=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index 1271fd1ae2f3..5f0ef1bf4c78 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -1001,8 +1001,11 @@ static int rdt_mon_features_show(struct kernfs_open_=
file *of,=0A=
 	struct rdt_resource *r =3D of->kn->parent->priv;=0A=
 	struct mon_evt *mevt;=0A=
 =0A=
-	list_for_each_entry(mevt, &r->evt_list, list)=0A=
+	list_for_each_entry(mevt, &r->evt_list, list) {=0A=
 		seq_printf(seq, "%s\n", mevt->name);=0A=
+		if (mevt->configurable)=0A=
+			seq_printf(seq, "%s_config\n", mevt->name);=0A=
+	}=0A=
 =0A=
 	return 0;=0A=
 }=0A=
=0A=